I'd think about getting a second opinion on the MRI that has already been done.

I couldn't find the reference just now, but when my urologist recommended an MRI, I asked that it be performed and read by the nearest NCI designated cancer center as opposed to his preferred community imaging center. I felt I would have more confidence in what the report said, if it was done by someone in a high volume center who does a lot more prostate MRIs than anyone in a community imaging center.

My urologist didn't appreciate my questioning the quality of his usual place, but he went along with it once I gave him several references to papers that found a wide variation even among the top flight cancer centers. One paper I remember found a wide variation in PiRads scores depending which MRI report person did the interpretation of the same images, at the same institution, i.e. Stanford. A national organization is or has just recently set up a plan to certify imaging centers as competent in reading prostate MRIs. Sorry I can't give exact references, no time at the moment.